Lenovo T400 screen goes dark issue, some video driver problem

Lenovo:
Motherboard:
CPU Type: Mobile DualCore Intel Core 2 Duo P8600, 2400 MHz (9 x 267)
Motherboard Chipset:  Intel Cantiga GM45
System Memory: 1992 MB (DDR3 SDRAM)
BIOS Type: Phoenix (08/19/08)
Display:
Video Adapter: Mobile Intel(R) 4 Series Express Chipset Family 
Video Adapter: Mobile Intel(R) 4 Series Express Chipset Family 
3D Accelerator: ATI Mobility Radeon HD 3470 
Problem/Issue:
Driver problem appeard after upgrading from XP to Windows 7.
From the Device Manager I saw that ATI Mobility Radeon HD 3470 was not working properly and
a) I did the "update driver software." After restart the screen light was darker than usual. (This was usual if I was working from battery but I was plugged in this time. ) 
As I'm not the best with computers I thought my drivers might be in conflict and to prevent serious damages, I just
b) disabled ATI Mobility Radeon HD 3470 from device manager. 
This actually resolved the dark screen problem.
c) then I went to Lenovo support site: http://support.lenovo.com/en_US/research/hints-or-tips/detail.page?&LegacyDocID=MIGR-72858
downloaded newest drivers for ATI Mobility Radeon HD 3400 (Switchable Graphics Driver)
and Intel 4500MHD (Intel GM45 Express Chip)
For some reason while installine the: Intel GM45 Display Driver (version 8.15.10.2302) gives me error:
"This Computer Does not meet the minimum requirements for installing the software"
Also some problem appeard when installing the new downloaded version:
ThinkPad Switchable Graphics Driver  (version 8.792.5-110424b-119200C)
d) so I went back to device manager and made an update to ATI Mobility Radeon  from there. 
Well, I got it working, but the screen went dark again. When I disable the driver it goes back to normal
brightness and when I enable it again, it stays normal.
I'll try to restart and see what happens

We had the excat same issue.
I could get the picuture back pressing the power button until it went to sleep and then wake it up again.
After the I went to device manager to delete all display drivers both Intel and ATI and then reboot.
doing the reboot windows found some drivers it could use.
I then installed the switchable driver from lenovo.
Now windows device manger report two display drivers:
1)
ATI Mobility Radeon HD 3400 Series, Version 8.792.5.2000, Driver manufacturer ATI Technologies Inc
2)
Mobile Intel(R) 4 Series Express Chipset Family, Version, Version 8.792.5.2000, Driver manufacturer ATI Technologies Inc
So it seams the switchable ATI driver take over the Intel card and the Intel driver is not needed.
At least the problem is solved for us.
Regards Anders

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